[cdi-dev] [JBoss JIRA] (CDI-414) Support for "self" injection

Mark Struberg (JIRA) issues at jboss.org
Wed Feb 17 13:19:01 EST 2016

    [ https://issues.jboss.org/browse/CDI-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164522#comment-13164522 ] 

Mark Struberg commented on CDI-414:

Rolling a few ideas with Antoine, we thought it might be better to have a code sample about how it looks today. 
And then we can figure how it _might_ look in the future

Here is the current solution to start with:
public class CountryService {

  private List<Country> cachedCountries;

  private @Inject CountryService _self;

  // this method doesn't need to open any transaction
  // so keep it fast without any interceptor and TX handling
  public List<Counry> getCountries() { 
    if (cachedCountries == null) {
    return cachedCountries;

  // but over here we might need a transaction...
  protected synchronized loadCountries() {
   if (countries != null) return;
   countries = em…. load all countries form DB

> Support for "self" injection
> ----------------------------
>                 Key: CDI-414
>                 URL: https://issues.jboss.org/browse/CDI-414
>             Project: CDI Specification Issues
>          Issue Type: Bug
>          Components: Resolution
>            Reporter: arjan tijms
>             Fix For: 2.0 (discussion)
> Many features of CDI and EJB work by means of a proxy that intercepts calls and adds 'aspects'. In Java it's however not possible to decorate the {{this}} pointer, so methods called on the same bean instance from within a method in the bean do not get their 'aspects' applied.
> This is a well known limitation, but in EJB it's possible to work around this by injecting a bean into itself. E.g.
> {code}
> @Stateless
> public class Foo {
>     @EJB
>     private Foo self;
>     // ...
> }
> {code}
> Also see http://adam-bien.com/roller/abien/entry/how_to_self_invoke_ejb
> Unfortunately using CDI and {{@Inject}} this doesn't work. Weld for instance fails the deployment and logs:
> {noformat}
> WELD-001443 Pseudo scoped bean has circular dependencies.
> {noformat}
> See also: http://adam-bien.com/roller/abien/entry/inject_vs_ejb
> Although there are workarounds, it would be great if {{@Inject}} in combination with CDI could support self injection as well.
> With that projects migrating from {{@EJB}} to {{@Inject}} can do so more easily and the capability can be convenient for new projects as well (e.g. calling two separate {{@Transactional}} methods from a single method without being required to create a new bean).

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